Feist will collaborate with Mastodon on a limited-edition 7in single due next year. The Canadian singer was introduced to the metal band on Later … with Jools Holland and thought "these two worlds [should] collide".

"We're going to do everything we can to work with Feist and have a split 7in to support independent record stores," Mastodon's Troy Sanders told MTV Canada . The next international Record Store Day will take place on 21 April 2012. "The idea is for Mastodon to cover a Feist song and throw some hair and dirt on it. [Then Feist will] take a Mastodon song and pretty it up a little bit."

The two acts got the idea in late October, when Feist played tunes from her new album Metals and Mastodon performed songs on the BBC show. Feist told HitFix: "[Mastodon frontman] Brent [Hinds] and I were nodding at each other, and he's like, 'Nice riff,' and I'm like 'Nice tone,'" she said. "So backstage I'm thinking about letting these two worlds collide, how they should collide, so I'm like, 'How about Metals meeting metal?' Brent was like: 'Well, I do like that Bad in Each Other song, I could see that.' Maybe now I will look into learning to cover Oblivion, or anything off [The Hunter]. That album's amazing."

Sanders said there is only "a short window" to do these recordings – "December". But a month seems more than enough time for Feist to coo her way through Stargasm or Blasteroid, and Mastodon could probably transform 1 2 3 4 into a single sinister riff.